Improved thermophysical properties of shape-stabilized NaNO3 using a modified diatomite-based porous ceramic for solar thermal energy storage

Feng Jiang, Zhiwei Ge, Xiang Ling, Daqiang Cang, Lingling Zhang and Yulong Ding

Renewable Energy, 2021, vol. 179, issue C, 327-338

Abstract: Corrosion is regarded as one of great challenges for the application of salts-based phase change materials. To address such problem, a novel skeleton of modified diatomite-based porous ceramic was used to load NaNO3 salt and develop shape-stabilized NaNO3. Particularly, thermophysical properties of composites with skeletons of unmodified and modified diatomite-based porous ceramics (UM-DC and M-DC4) were analyzed. The results showed that these two skeletons effectively prevented NaNO3 from leakage and were chemically compatible with NaNO3. Shape-stabilization of NaNO3 using porous ceramic hardly changed phase transition temperature, but decreased latent heat and enhanced thermal stability. M-DC4 possessed a capacity to load 58.67 wt% salt, nearly 10 wt% higher than other porous ceramics. Compared with NaNO3/UM-DC, NaNO3/M-DC4 performed a higher thermal energy storage density and efficiency of 382.92 J/g and 58.71%, respectively, within 130–330 °C. Importantly, NaNO3/M-DC4 exhibited much better cycling stability during 500 thermal cycles, benefited by the improved micro-flow of molten salt in M-DC4; while NaNO3/UM-DC appeared crack after 100 thermal cycles. Accordingly, the novel skeleton could greatly enhance thermophysical properties of shape-stabilized NaNO3. Such composites could be easily integrated into solar thermal energy storage system. This work proposed a new strategy for the application of salts-based phase change materials.

Keywords: Thermophysical properties; Porous ceramic; Shape-stabilized NaNO3; Diatomite; Solar thermal energy storage (search for similar items in EconPapers)
Date: 2021
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Citations: View citations in EconPapers (8)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:179:y:2021:i:c:p:327-338

DOI: 10.1016/j.renene.2021.07.023

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